Work holding attachment for drill presses



July 13, 1948. J; T. BETTS I 0 WORKHOLDING ATTACHMENT FOR DRILL PRESSESI Filed 25, 1943 V 1 x m 1 /i 7' 1 M 'fifi l 6 7 I 4 i/ a I ig] Hm, I aa: s LIE." ,..'I I -I (/bb]? If INVVENTOR.

BY I

ATTDRNEYS Patented July 13, 1948 WORK HOLDING ATTAonM'ENrFom DRILLPRESSES I John :TtBetts, g Application August 23, is ispseriai No.493,684 r "The present inventionrelates .to improvements in work holdingattachments for drill presses and has for an object thereof theprovision of such a device which will efiectively hold work in positionfor drilling.

Another object of the invention is the provision of a. work holdingdevice which can be detachably mounted on a conventional drill press.

A further object of the invention is the provision of a drill press workholder having means for engaging work pieces having angular as well ascurved contours.

Still another object of the invention is the provision of an attachmentof the aforesaid character which is relatively simple and durable inconstruction and efficient in use.

Other objects and advantages of the invention will become apparent asthe description progresses.

In the accompanying drawing forming a part of this specification and inwhich like numerals are employed to designate corresponding partsthroughout:

Figure 1 is a side elevational view of the device in operative positionon a drill press.

Figure 2 is a top plan view of the assembled device.

Figure 3 is a detail sectional view taken on the vertical planeindicated by the line 33 of Figure 2, and.

Figure 4 is a perspective view illustrating a slightly modified form ofthe work holder.

Referring to the drawing, wherein for the purpose of illustration isshown a preferred example of the invention, 5 generally designates thebody of the device which essentially embodies an elongated rectangularplate. At its outer end the plate 5 has one corner recessed to form aright angular work engaging notch 6 preferably having its greatestdimension longitudinally of the plate as shown at Figure 2. This outerend portion of the plate is also shaped to provide a re-entrant recess 1medially of the longitudinal edge of the notch 6 to form an inwardlytapering V-shaped work engaging notch.

The opposite end of the plate is shaped to provide medially of its sideedges, an arcuate concavity 8 designed to conform to the circumferentialcontour of a drill press column indicated at C of Figure 1. At each sideof the con-cavity 8, the inner end edge of the plate is provided with apair of end faces 9 disposed obliquely in a direction transverse of theplate, for a purpose which will be later described.

To the inner end of the plate 5 are removably connected a pairzof.complementary pclamp 258C- tions lll each ofnwhich embodies an arcuateportion ll havingradially extending. lugs l2. and 13 at the respectiveends:thereof; The-lugs 12 ,of the -.complementary sections I 0 :are-adapted,;.in assembly, to assume contiguous parallel positions and onemay be formed with a smooth through bore l4 while the other is providedwith an internally threaded bore l5 to receive the threaded shank of aconnecting cap screw It. The lugs [3 at the opposite ends of thesesections are designed for assembly with the oblique transverse races 9of the plate and, with this in mind, each of these lugs has its outeredge I1 disposed at an acute angle with the outer face of the lug toassume alignment with the longitudinal edges of the plate whenassociated therewith. Furthermore each of the lugs l3 has a smooththrough bore 18 adapted to assume alignment with an interiorly threadedbore IS in the plate so as to receive the threaded shank of a cap screw20. As will be noted from Figure 2, the sections ID are formed to assumecircular assembly relation with the plate to embrace the drill presscolumn C, the said clamp sections and the plate preferably havingcomplementary boss sections Ill projecting below the bottom face levelof the body in circular arrangement to rest upon the table of the drillpress.

By suitable turning of the screw I6 the column clamping end of thedevice may be loosened to be swung in a circle about the column C as acenter to center the work beneath the drill bit D and to permit angularadjustment of the body to a non-working inoperative position or to therequired operative position for holding work pieces for drilling atwhich time the clamp is tightened to hold the body against accidentalmovement. If the work piece has an angular contour as indicated at W itis arranged to fit within the right angular recess or notch 6 and isfirmly held in proper position for drilling by the drill bit indicatedD. If, on the other hand the work piece has a circular contour asindicated at Y it is fitted in the V-shaped notch 1. By loosening theset screw l6, and by placing a sample of the work on the table of thepress and in contact with the wallsfor the recess 1, the plate 5 may beswung to center the sample with the drill bit D. The screw I6 is thentightened to secure the plate in this position, so that all subsequentsamples of the same work will be automatically centered on being placedon the table in contact with the side walls of the recess 1, assuggested in Figure 2. This is also true of the notch 6. If desired thethe wall of the clamp end of the work holder and the column or it may besecured to the severaparts of the clamp end of the work holde1j as 1 g It 1; ,Number It is to be understood that the forms of my inventionherewith shown and described are toteshown in the drawing.

taken as preferred examples of the same and that various changesrelative to the material, size,

shape and arrangement of parts may be resorted Y to without departingfrom the spirit of the invention or the scope of the subjoined claim.

Having thus described my invention, I claim: In a work holder of thecharacter described, an K elongated rectangular shaped plate;the outerend portion of the plate having an angular recess in one corner thereofand a V-shaped recess extending inwardly from a wall of said firstrecess, and addustable clamp means at the opposite end of the plate forattaching the same to the column of a drill press for movement in acircle with the drill press column as a. center.

JOHN T. BETTS.

REFERENCES CITED 2 The following references are of record in the ifl leof this patent:

UNITED STATES PATENTS Name Date 391,824 Taylor Oct. 30, 1888 410,803McDaniel Sept. 10, 1889 702,217 Jacobs June 10, 1902 1,464,375Vidinghoff Aug. 7, 1923 "1514,8512 Scharf Jan. 18, 1927 2,240,242 ColeMar. 1'7, 1942 2 ,276,819 Boehmer Apr. 10,-1933 FOREIGN PATENTS Number 1Country Date 574,211 Germany Apr. 10, 1933

